Nope, no problems for me on my end right now--I just tried it, and it's working as fast as I'm used to. It could be that it got temporarily bogged down with traffic because of bitcoin's price rise. I'm sure there are a lot of folks who are doing a lot of searching for bitcoin and/or other cryptos, and CMC is usually one of the first search results for most of them.
I don't have issue on Coinmarketcap, but I prefer using Coingecko because some of the coins that I am holding are tracked on Coingecko and not on Coinmarketcap
I don't use either one all that often, but I agree with you. Coingecko does have seemingly more coins/tokens listed than does CMC, though each one has all the major players in the crypto space listed. Comes down to a matter of taste, I suppose.